Bug 422918

Summary:	Transitions between png's with text draw the shadows before the transition reaches them.
Product:	[Applications] kdenlive	Reporter:	gdiffey
Component:	Video Effects & Transitions	Assignee:	Vincent PINON <vpinon>
Status:	RESOLVED FIXED
Severity:	normal	CC:	fritzibaby, jb
Priority:	NOR
Version:	23.08.4
Target Milestone:	---
Platform:	Debian unstable
OS:	Linux
Latest Commit:		Version Fixed In:
Sentry Crash Report:

Description gdiffey 2020-06-13 14:06:58 UTC

SUMMARY

When transitioning between two png images of text on a background with shadows the transition is not executed correctly it appears that the shadow is drawn for the full frame before the transition effect reaches it.

I've made a testcase project https://drive.google.com/drive/folders/1APYCPEytd3Kbdc4zoS4Nnl4Cl88jsCAx?usp=sharing





STEPS TO REPRODUCE
1. generate png with text and shadows in libreoffice impress
2. place such png in kdenlive
3. transition with wipe set to anything other than disolve

OBSERVED RESULT

Drop shadow appears for the to image at the beginning of the transition


EXPECTED RESULT

Shadow appears with other transitioning content


SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Operating System: Debian GNU/Linux 
KDE Plasma Version: 5.17.5
KDE Frameworks Version: 5.62.0
Qt Version: 5.12.5
Kernel Version: 5.6.0-2-rt-amd64
OS Type: 64-bit
Processors: 4 × Intel® Core™ i3-4150 CPU @ 3.50GHz
Memory: 15.6 GiB of RAM


ADDITIONAL INFORMATION

Comment 1 emohr 2024-01-06 13:32:45 UTC

Tested with Kdenlive 23.08.4. Wipe-Right or Wipe-Down does the trick. Can you confirm?

Comment 2 Bug Janitor Service 2024-01-21 03:45:29 UTC

Dear Bug Submitter,

This bug has been in NEEDSINFO status with no change for at least
15 days. Please provide the requested information as soon as
possible and set the bug status as REPORTED. Due to regular bug
tracker maintenance, if the bug is still in NEEDSINFO status with
no change in 30 days the bug will be closed as RESOLVED > WORKSFORME
due to lack of needed information.

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If you have already provided the requested information, please
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Comment 3 gdiffey 2024-01-22 00:40:50 UTC

The test case still fails on 28.08.04 on debian sid for me.

I will try the snap/flatpack when I get a chance.

Comment 4 emohr 2024-01-22 17:07:23 UTC

Please check with the AppImage as well.

Comment 5 Jean-Baptiste Mardelle 2024-01-26 14:58:17 UTC

The problem is that the shadows in your png images are in fact a transparent areas. This is why you get such strange result with the Wipe and Luma method. You can use the "Wipe Down" transition instead that works very closely but handles alpha channel differently